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Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 500/10 Or, 10x = 50 Or, x = 5 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 35 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 55 km/hr Required time taken = (70/35) + (275/55) = 2 + 5 = 7 hours
24% of 150% of 500 + 140 = ? × 8
(25)² × 4 ÷ 5 + (3)³ + 48=? + 425
322 – 182 + 11 × 24 = ?
15% of 5000 - √900 = ? + 10% of 1800
360 ÷ 4 ÷ 3 = 150 – ?
[(4√ (7) +√ (7))× (7√ (7) + 6√ (7))] - 87 = ?
...25639 – 5252 – 3232 = ?
∛157464 =?
702 ÷ 26 + 142 - 20% of 310 = ? - 15% of 420